centrifuge machines have a wide range of applications and are suitable for chemical, petroleum, food, pharmaceutical, beneficiation, coal, water treatment and shipbuilding sectors. With the improvement of China's centrifuge machine technology and the development and growth of centrifuge machine companies, the gap between domestic centrifuge machines and imported products is shrinking. At present, domestic enterprises have mastered core technologies, and domestic brands have also risen further. The diversified pattern of centrifuge machines has become more prominent.
With the rapid development of centrifuge machines, market demand is gradually increasing, and product categories are becoming more and more abundant. Many users have made difficult choices. In the centrifuge machine, the motor is an indispensable accessory that reduces the operating noise, lowers the motor temperature, and lubricates the bearings. The same centrifuge machine can be equipped with a brush motor or a brushless motor, and the user can choose between the advantages and disadvantages of both, and it can also be a standard to be measured when selecting a product.
A brush motor uses a carbon brush at the inner electrode of the motor. The two brushes of the centrifuge machine motor, namely a copper brush or a carbon brush, are fixed to the back cover of the motor through an insulating seat to directly introduce the positive and negative poles of the power supply to the motor. On the commutator of the rotor, the commutator communicates with the coil on the rotor, and the alternating polarity of the three coils rotates with the two fixed magnets on the housing to form a force.
For the brushed motor, it has the advantages of simple manufacture and low cost. However, there are some disadvantages. For example, under normal circumstances, the speed of operation is constant after the machine is started, and the speed regulation is not easy. Because the commutator and the rotor are fixed together, and the brush and the housing are fixed together, friction occurs between the brush and the commutator during the rotation of the motor to generate a large amount of resistance and heat. Therefore, the efficiency of the brushed motor is relatively low, and the loss is reduced. Big.
The brushless motor is also a carbon brush at the inner structure of the motor. Specifically, its no-load resistance mainly comes from the rotational contact point between the rotor and the stator. Therefore, the general brushless motor uses ball bearings at both ends of the rotor to reduce the friction, so that there will not be a lot of frictional resistance and heat. Like brush motors, brushless motors have disadvantages. The cost of the speed control system is higher than the speed control system of the brushed high-speed motor, and the controller of the centrifuge machine is prone to failure during use.
Users can choose the right product based on the advantages and disadvantages of brushed motors and brushless motors. However, in general, brushed motors have a low manufacturing cost, so the market price is relatively affordable, and the operating speed is constant after startup. Suitable for general laboratories and research institutes.
The brushless motor features high controllability, low power loss, low noise, and no dust and environmental protection. Although it is relatively expensive compared to brushed motors, it has been favored by large laboratories and research institutes, especially for environmental protection, long service life, and energy-saving features, making it more applicable to centrifuge machines. The wider it is.
In addition, when selecting a centrifuge machine product, users can also compare products based on performance. The first is anti-corrosion performance. The materials separated by the centrifuge machine generally have a certain degree of corrosivity, and the materials that are in contact with the materials must meet the requirements of corrosion resistance and ensure safe use. Structural materials, gasket materials, surface treatment measures, and the material of the filter cloth should all be determined at the time of model selection.
Followed by explosion-proof performance. The materials handled by the centrifuge machine contain flammable and explosive substances such as organic solvents, so the centrifuge machine should have explosion-proof properties. The explosion-proof performance is determined by the explosion-proof requirements of the process. In the past two years, helium gas protection requirements have been put forward for most of the materials containing organic solvents such as solvents.
The last is the separation performance. Separation performance is a basic function, including the separation effect, washing effect, processing capacity, and automation degree. Due to the differences in the nature of materials, including the viscosity, density of the material, solid-liquid ratio of the slurry, it is difficult to accurately determine the final separation effect. In general, the separation factor is an important factor affecting the centrifuge machine separation effect. The separation factor is related to the rotation speed of the drum and the drum diameter, and is proportional to the square of the angular velocity of the drum.